From PBS's Central Texas Gardening show 6/17.
1 1/2 aspirin in a glass just barely covered with apple cider vinegar until dissolved. Pour this into a 2 gallon sprayer and spray your plants about once every two weeks with mixture.
Mixture for Boosting Immune System/Improve Yield...
Interesting- worth a shot.
They also said adding 1 aspirin to a vase of flowers extends their life.